Electric water heater

Abstract

The utility model relates to an electric water heater. An inner container is provided with a containing cavity and a mounting hole communicating with the containing cavity. The heater is arranged in the accommodating cavity; the connecting flange comprises a connecting part and a flange part, and the connecting part is connected to the end part of the heater and penetrates through the mounting hole; the flange part sleeves the heater and is connected with the connecting part; the flange part is positioned in the accommodating cavity; the fastener is connected with the connecting part and is positioned outside the accommodating cavity; the sealing piece is arranged in the mounting hole in a penetrating manner and sleeves the connecting part; the sealing piece is clamped between the flange part and the fastening piece; the diameter of the end, close to the flange part, of the sealing piece is larger than or equal to that of the flange part. The diameter of the end, close to the fastener, of the sealing piece is larger than or equal to the diameter of the fastener. The heater and the inner container are sealed and insulated through the sealing piece and do not make contact, it is ensured that the heater cannot be communicated with the inner container through the connecting flange, and liquid stored in the inner container is prevented from leaking and a primary battery is prevented from being formed between the heater and the inner container.

Description

Technical Field

[0001] This application relates to the field of electric water heaters, and more particularly to an electric water heater. Background Technology

[0002] Electric water heaters on the market are classified into open-type and pressurized-type based on whether the water tank is pressurized. Pressurized water tanks are mostly enamel-lined tanks, while open-type water tanks are mostly stainless steel-lined tanks, with enamel-lined or stainless steel heaters as the main internal heaters.

[0003] In existing technologies, stainless steel inner tanks and stainless steel heaters are made of different metals due to factors such as machinability and heat resistance. Furthermore, the heater is installed on the electric water heater using flanges or threads. In these ways, the inner tank and the heater are electrically connected. During operation, the liquid stored in the stainless steel inner tank is immersed in the same medium. There is a potential difference between the metals, which forms a galvanic cell and causes electrochemical corrosion. This accelerates the corrosion of the heater, eventually leading to perforation and leakage, causing personal injury and property damage. Utility Model Content

[0004] This application provides an electric water heater that uses a seal to insulate and seal the heater from the inner tank, ensuring that the heater does not conduct electricity to the inner tank through the connecting flange, thus preventing leakage of liquid stored in the inner tank and the formation of a galvanic cell between the two.

[0005] Therefore, this application provides an electric water heater, comprising:

[0006] The inner liner has a receiving cavity and a mounting hole communicating with the receiving cavity;

[0007] A heater is disposed within the receiving cavity;

[0008] A connecting flange includes a connecting part and a flange part. The connecting part is connected to the end of the heater and passes through the mounting hole. The flange part is fitted onto the heater and connected to the connecting part. The flange part is located within the receiving cavity.

[0009] Fasteners are connected to the connecting portion and are located outside the receiving cavity;

[0010] A sealing element is inserted through the mounting hole and fitted onto the connecting portion; the sealing element is sandwiched between the flange portion and the fastener;

[0011] Wherein, the diameter of the end of the seal near the flange is greater than or equal to the diameter of the flange; the diameter of the end of the seal near the fastener is greater than or equal to the diameter of the fastener.

[0012] As a further explanation of the above solution, the inner liner also includes a barrel body, an upper cover, and a lower cover. The upper cover is located at the top of the barrel body, and the lower cover is located at the bottom of the barrel body. The upper cover, the barrel body, and the lower cover together form the receiving cavity. The mounting hole is located on the lower cover.

[0013] As a further explanation of the above solution, the outer wall of the seal is provided with a groove, and the wall of the mounting hole is inserted into the groove.

[0014] As a further explanation of the above solution, the width of the groove is less than the thickness of the lower cover.

[0015] As a further explanation of the above solution, the fastener is threadedly connected to the connecting part.

[0016] As a further explanation of the above solution, the connecting part is fitted with a grounding ring for grounding the heater.

[0017] As a further explanation of the above solution, the grounding ring is fastened to the connection part by a thin nut.

[0018] As a further explanation of the above scheme, the heater includes a heating element, which includes multiple straight pipe sections and multiple bent pipe sections, with the end of each bent pipe section connected to a straight pipe section.

[0019] As a further explanation of the above solution, there are two mounting holes, and each mounting hole is provided with a connecting flange;

[0020] The two ends of the heating element are positioned close together, and the two ends of the heating element are respectively connected to the two connecting flanges.

[0021] As a further explanation of the above solution, it also includes a wiring terminal, which is connected to the connection portion and located outside the receiving cavity.

[0022] The beneficial effects of this application are:

[0023] The electric water heater includes: an inner tank having a receiving cavity and a mounting hole communicating with the receiving cavity; a heater disposed within the receiving cavity; a connecting flange including a connecting portion and a flange portion, the connecting portion being connected to the end of the heater and passing through the mounting hole; the flange portion being fitted onto the heater and connected to the connecting portion; the flange portion being located within the receiving cavity; a fastener being connected to the connecting portion and located outside the receiving cavity; a sealing element passing through the mounting hole and fitted onto the connecting portion; the sealing element being sandwiched between the flange portion and the fastener; wherein, the diameter of the end of the sealing element near the flange portion is greater than or equal to the diameter of the flange portion; the diameter of the end of the sealing element near the fastener is greater than or equal to the diameter of the fastener. That is, the sealing element seals and insulates the heater from the inner tank, preventing contact and ensuring that the heater does not conduct electricity to the inner tank through the connecting flange. This avoids leakage of liquid stored in the inner tank and the formation of a galvanic cell between them, preventing electrochemical corrosion that could cause the stainless steel heater to corrode and perforate, leading to the risk of electric leakage and property damage. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a diagram showing the installation structure of an electric water heater.

[0026] Figure 2 for Figure 1 A magnified view of part A in the image;

[0027] Figure 3 for Figure 1 Exploded structural diagram;

[0028] Figure 4 for Figure 1 A schematic diagram of the structure of the central sealing component.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Heater; 2. Seal; 21. First abutment part; 22. Second abutment part; 23. Support part; 24. Groove; 3. Fastener; 4. Grounding ring; 5. Thin nut; 6. Connecting flange; 61. Flange part; 62. Connecting part; 7. Inner liner; 71. Top cover; 72. Barrel body; 73. Bottom cover; 8. Terminal block; 9. Heating element; 10. Mounting hole. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] It should be noted that the heater 1, heating element 9, connecting flange 6, and terminal block 8 are all made of SUS310S stainless steel; the inner liner 7, body 72, upper cover 71, and lower cover 73 are all made of SUS304 stainless steel or SUS316 stainless steel.

[0033] like Figures 1 to 4 As shown, an electric water heater includes: an inner tank 7, a heater 1, a connecting flange 6, a fastener 3, and a sealing element 2; the inner tank 7 has a receiving cavity and a mounting hole 10 communicating with the receiving cavity; the heater 1 is disposed in the receiving cavity; the connecting flange 6 includes a connecting portion 62 and a flange portion 61, the connecting portion 62 being connected to the end of the heater 1 and passing through the mounting hole 10; the flange portion 61 is sleeved on the heater 1 and connected to the connecting portion 62; the flange portion 61 is located inside the receiving cavity; the fastener 3 is connected to the connecting portion 62 and is located outside the receiving cavity; the sealing element 2 passes through the mounting hole 10 and is sleeved on the connecting portion 62; the sealing element 2 is sandwiched between the flange portion 61 and the fastener 3; wherein, the diameter of the end of the sealing element 2 near the flange portion 61 is greater than or equal to the diameter of the flange portion 61; the diameter of the end of the sealing element 2 near the fastener 3 is greater than or equal to the diameter of the fastener 3.

[0034] The sealing element 2 isolates the inner liner 7 from the heater 1 and other components at their points of contact. Specifically, the diameter of the end of the sealing element 2 near the flange 61 is greater than or equal to the diameter of the flange 61. This ensures that the lower cover 73 is insulated from the flange 61 and does not contact it. Simultaneously, the diameter of the end of the sealing element 2 near the fastener 3 is greater than or equal to the diameter of the fastener 3. This also ensures that the lower cover 73 is insulated from the connecting part 62 and does not contact it. This forms a double-sealed insulation structure, ensuring that the heater 1 does not conduct electricity to the inner liner 7 through the connecting flange 6, effectively avoiding the galvanic effect formed when two different metal materials come into contact. Preferably, the sealing element 2 is made of high-temperature resistant nitrile rubber, which has good corrosion resistance, thus extending its service life.

[0035] Preferably, the inner liner 7 further includes a barrel body 72, an upper cover 71, and a lower cover 73. The upper cover 71 is located at the top of the barrel body 72, and the lower cover 73 is located at the bottom of the barrel body 72. The upper cover 71, the barrel body 72, and the lower cover 73 together form the receiving cavity; the mounting hole 10 is located on the lower cover 73. The combination of the upper cover 71, the barrel body 72, and the lower cover 73 forms a complete closed receiving cavity, ensuring effective protection for internal components such as the heating element 9. Preferably, the upper cover 71, the barrel body 72, and the lower cover 73 are sealed by welding; the mounting hole 10 on the lower cover 73 facilitates the fixing of the heater 1, ensuring its stability and preventing displacement during use. It is understood that a reasonable internal structure can guide water flow more evenly through the heating element 9, further improving heat transfer efficiency and shortening heating time.

[0036] Preferably, the outer wall of the sealing member 2 is provided with a groove 24, and the wall of the mounting hole 10 is inserted into the groove 24. Specifically, the sealing member 2 includes a first abutting part 21, a supporting part 23, and a second abutting part 22. The two ends of the supporting part 23 are respectively connected to the first abutting part 21 and the second abutting part 22. The supporting part 23 passes through the mounting hole 10 and is sleeved on the connecting part 62. The first abutting part 21 is located between the flange part 61 and the cavity wall of the receiving cavity. The diameter of the first abutting part 21 is greater than or equal to the diameter of the flange part 61. The second abutting part 22 is located between the fastener 3 and the outer wall of the inner liner 7. The diameter of the second abutting part 22 is greater than or equal to the diameter of the fastener 3. The first abutting part 21, the second abutting part 22, and the supporting part 23 surround and form the groove 24. In other words, the two ends of the seal abut against the flange 61 and the fastener 3 respectively through the first abutment part 21 and the second abutment part 22, forming a double sealing structure, which further enhances the sealing effect. This achieves the sealing and insulation between the heater 1 and the inner liner 7 by the seal 2, effectively avoiding the galvanic effect formed when two different metal materials come into contact. The support part 23 passes through the mounting hole 10 and is fitted onto the connecting part 62, providing stable support and ensuring that the entire seal 2 will not shift or deform under force, thus improving the stability of the overall structure.

[0037] Preferably, the width of the groove 24 is less than the thickness of the lower cover 73. It should be understood that the width of the groove 24 refers to the direction in which the outer wall of the seal 2 mates vertically downwards with the lower cover 73 along the wall of the mounting hole 10. A smaller groove 24 width allows the lower cover installed in the groove 24 to fit more tightly with the seal 2 and the fastener 3, enhancing the sealing effect and preventing water or air leakage, which is especially important under high temperature and high pressure environments. At the same time, it also improves the overall sealing performance and stability of the structure.

[0038] Preferably, the fastener 3 is threadedly connected to the connecting part 62, with the internal thread of the fastener 3 connecting to the external thread of the connecting part 62. This allows the heater 1 to be pressed against the fastener 3 by the connecting part 62 and sealed, preventing liquid in the water tank from leaking through the mounting hole 10 on the lower cover 73. Furthermore, the stability of the threaded connection can be further enhanced by using accessories such as lock nuts and spring washers to prevent loosening caused by vibration. Additionally, an anti-corrosion coating can be applied to the thread surface, or stainless steel can be used to improve the corrosion resistance of the threaded connection and extend its service life.

[0039] Preferably, the connecting part 62 is fitted with a grounding ring 4 for grounding the heater 1, which ensures reliable grounding of the heater 1 and can effectively prevent electric shock accidents caused by leakage.

[0040] Preferably, the grounding ring 4 is fastened to the connecting part 62 by a thin nut 5. Using the thin nut 5 to fasten it not only ensures the stable connection of the grounding ring 4, but also facilitates its disassembly and replacement, simplifying the installation and maintenance process.

[0041] Preferably, the heater 1 includes a heating element 9, which comprises multiple straight pipe sections and multiple bent pipe sections, with each bent pipe section connected to one of the straight pipe sections at its end. Specifically, each bent pipe section is connected to two different straight pipe sections at both ends. For example, one end of the first bent pipe section is connected to the first straight pipe section, and the other end is connected to the second straight pipe section; one end of the second bent pipe section is connected to the second straight pipe section, and the other end is connected to the third straight pipe section, and so on, forming a continuous loop. Finally, both the first and last straight pipe sections have one port that is not yet connected to other components. At this point, these two ports can be connected to two connecting flanges 6 respectively, ensuring that the heating element 9 can be securely installed in the inner liner 7.

[0042] Preferably, there are two mounting holes 10, and each mounting hole 10 is provided with a connecting flange 6; the two ends of the heating tube 9 are positioned close together, and the two ends of the heating tube 9 are respectively connected to the two connecting flanges 6; this ensures that the installation of the heating tube 9 in the inner liner 7 is more stable, avoiding loosening or falling off due to vibration or other external forces. Preferably, a sealing element 2 can be sandwiched between the connecting flange 6 and the fastener 3 to further ensure the sealing of the connection and prevent leakage of electricity and water.

[0043] Preferably, the device further includes a terminal block 8, which is connected to the connection portion 62 and located outside the receiving cavity. It is understood that placing the terminal block 8 outside the receiving cavity not only fulfills its wiring function but also effectively avoids the risk of contact between electrical components and the liquid stored inside the inner liner 7, thus enhancing its safety performance.

[0044] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electric water heater, characterized in that, include: The inner liner (7) has a receiving cavity and a mounting hole (10) communicating with the receiving cavity; A heater (1) is disposed within the receiving cavity; A connecting flange (6) includes a connecting part (62) and a flange part (61). The connecting part (62) is connected to the end of the heater (1) and passes through the mounting hole (10). The flange part (61) is sleeved on the heater (1) and connected to the connecting part (62). The flange part (61) is located inside the receiving cavity. Fastener (3) is connected to the connecting part (62) and is located outside the receiving cavity; A sealing element (2) is inserted through the mounting hole (10) and fitted onto the connecting part (62); the sealing element (2) is sandwiched between the flange part (61) and the fastener (3); Wherein, the diameter of the end of the seal (2) near the flange (61) is greater than or equal to the diameter of the flange (61); the diameter of the end of the seal (2) near the fastener (3) is greater than or equal to the diameter of the fastener (3).

2. The electric water heater according to claim 1, characterized in that, The inner liner (7) also includes a barrel body (72), an upper cover (71) and a lower cover (73). The upper cover (71) is located at the top of the barrel body (72), and the lower cover (73) is located at the bottom of the barrel body (72). The upper cover (71), the barrel body (72) and the lower cover (73) together form the receiving cavity. The mounting hole (10) is located on the lower cover (73).

3. The electric water heater according to claim 2, characterized in that, The outer wall of the seal (2) is provided with a groove (24), and the wall of the mounting hole (10) is inserted into the groove (24).

4. The electric water heater according to claim 3, characterized in that, The width of the groove (24) is less than the thickness of the lower cover (73).

5. The electric water heater according to claim 1, characterized in that, The fastener (3) is threadedly connected to the connecting part (62).

6. The electric water heater according to claim 1, characterized in that, The connecting part (62) is fitted with a grounding ring (4) for grounding the heater (1).

7. The electric water heater according to claim 6, characterized in that, The grounding ring (4) is fastened to the connecting part (62) by a thin nut (5).

8. The electric water heater according to claim 1, characterized in that, The heater (1) includes a heating tube (9), which includes multiple straight tube sections and multiple bent tube sections, with the end of each bent tube section connected to a straight tube section.

9. The electric water heater according to claim 8, characterized in that, The number of mounting holes (10) is two, and each mounting hole (10) is provided with a connecting flange (6); The two ends of the heating tube (9) are positioned close to each other, and the two ends of the heating tube (9) are respectively connected to the two connecting flanges (6).

10. The electric water heater according to claim 1, characterized in that, It also includes a terminal block (8) connected to the connection part (62) and located outside the receiving cavity.

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